HD 171819: Difference between revisions
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h 39m 14.2929s[1] |
| Declination | −47° 54′ 35.1520″[1] |
| Apparent magnitude (V) | 5.84 ± 0.01[2] |
| Characteristics | |
| Spectral type | A7 IV/V[3] or A3 V[4] |
| B−V color index | +0.23[5] |
| Astrometry | |
| Radial velocity (Rv) | −9.0 ± 4.3[6] km/s |
| Proper motion (μ) | RA: +25.426[1] mas/yr Dec.: +13.951[1] mas/yr |
| Parallax (π) | 10.4348 ± 0.1045 mas[1] |
| Distance | 313 ± 3 ly (95.8 ± 1.0 pc) |
| Absolute magnitude (MV) | +0.65[7] |
| Details | |
| Mass | 1.84 ± 0.39[8] M☉ |
| Radius | 3.90 ± 0.54[8] R☉ |
| Luminosity | 41.4[9] L☉ |
| Surface gravity (log g) | 3.5 ± 0.3[8] cgs |
| Temperature | 7,311[9] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 171819 (HR 6986) is a solitary[10] star located in the southern constellation Telescopium. It has an apparent magnitude of 5.84,[2] making it faintly visible to the naked eye if viewed under ideal conditions. The star is situated at a distance of 313 light years[1] but is approaching the Solar System with a heliocentric [[radial velocity] of −9 km/s.[6]
HD 171819 has a stellar classification of A7 IV/V, indicating that the object is an A-type star with a blended luminosity class of a main sequence star and subgiant.[3] However, W. Buscombe gave it a class of A3 V, making it an ordinary A-type main-sequence star.[4] At present it has 1.84 times the mass of the Sun and 3.9 times the radius of the Sun.[8] It shines at 41.4 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 7,311 K,[9] giving it a white glow.
References
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ^ a b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H.
- ^ a b Buscombe, W. (1 May 1969). "Line Strengths for Southern OB stars--II: Observations with Moderate Dispersion". Monthly Notices of the Royal Astronomical Society. 144 (1): 31–39. Bibcode:1969MNRAS.144...31B. doi:10.1093/mnras/144.1.31. ISSN 0035-8711.
- ^ Stoy, R. H. (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 27: 119. Bibcode:1968MNSSA..27..119S. ISSN 0024-8266.
- ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
- ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737.
- ^ a b c d Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; Paegert, Martin; Lee, Nathan De; Torres, Guillermo; Latham, David W.; Charpinet, Stéphane; Dressing, Courtney D.; Huber, Daniel; Kane, Stephen R.; Lépine, Sébastien; Mann, Andrew; Muirhead, Philip S.; Rojas-Ayala, Bárbara; Silvotti, Roberto; Fleming, Scott W.; Levine, Al; Plavchan, Peter (20 August 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv:1706.00495. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050. ISSN 0004-6256.
- ^ a b c d McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976
